Mechanical heat detector



FIG. 1 is a perspective view of the mechanical heat detector.

FIG. 2 is a front elevation view thereof.

FIG. 3 is a first side elevation view thereof.

FIG. 4 is a second side elevation view thereof.

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The rear view of the mechanical heat detector illustrated in FIGS. 1-6 is hereby disclaimed and forms no part of the claimed design. 

CLAIM The ornamental design for a mechanical heat detector, as shown and described. 